Add rootless runner to the Makefile and improve target platform handl…

…ing. (actions#2005)

* Add rootless runner to the Makefile and improve target platform handling

* Add rootless image to docker-push-ubuntu target

* Update runner/Makefile

* Update runner/actions-runner-dind-rootless.dockerfile

* Update runner/actions-runner-dind.dockerfile

* Update runner/actions-runner.dockerfile

Co-authored-by: Yusuke Kuoka <ykuoka@gmail.com>

runner/Makefile

@@ -27,7 +27,19 @@ else
 	export PUSH_ARG="--push"
 endif
 
-docker-build-ubuntu:
+check-target-platform:
+# Handle target platform variants.
+# arch command on OS X reports "i386" for Intel CPUs regardless of bitness
+ifeq ($(TARGETPLATFORM), $(filter $(TARGETPLATFORM), x86_64 x64 amd64 i386 linux/amd64))
+  TARGETPLATFORM = linux/amd64
+else ifeq ($(TARGETPLATFORM), $(filter $(TARGETPLATFORM), arm64 aarch64 linux/arm64))
+  TARGETPLATFORM = linux/arm64
+else
+  $(warning Unsupported target platform $(TARGETPLATFORM))
+  $(error Supported target platforms: linux/amd64 and linux/arm64)
+endif
+
+docker-build-ubuntu: check-target-platform
 	${DOCKER} build \
 	  --build-arg TARGETPLATFORM=${TARGETPLATFORM} \
 	  --build-arg RUNNER_VERSION=${RUNNER_VERSION} \
@@ -44,7 +56,6 @@ docker-build-ubuntu:
 	${DOCKER} build \
 	  --build-arg TARGETPLATFORM=${TARGETPLATFORM} \
 	  --build-arg RUNNER_VERSION=${RUNNER_VERSION} \
-	  --build-arg RUNNER_CONTAINER_HOOKS_VERSION=${RUNNER_CONTAINER_HOOKS_VERSION} \
 	  --build-arg DOCKER_VERSION=${DOCKER_VERSION} \
 	  -f actions-runner-dind-rootless.dockerfile \
 	  -t ${DIND_ROOTLESS_RUNNER_NAME}:${TAG} .
@@ -74,3 +85,9 @@ docker-buildx-ubuntu:
 	  -f actions-runner-dind.dockerfile \
 	  -t "${DIND_RUNNER_NAME}:${TAG}" \
 	  . ${PUSH_ARG}
+	${DOCKER} buildx build --platform ${PLATFORMS} \
+	  --build-arg RUNNER_VERSION=${RUNNER_VERSION} \
+	  --build-arg DOCKER_VERSION=${DOCKER_VERSION} \
+	  -f actions-runner-dind-rootless.dockerfile \
+	  -t "${DIND_ROOTLESS_RUNNER_NAME}:${TAG}" \
+	  . ${PUSH_ARG}